BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//CERN//INDICO//EN
BEGIN:VEVENT
SUMMARY:Acidophilic iron- and sulfur-oxidizing bacteria driven primary min
 eral weathering and secondary mineral formation in Fe ore tailings
DTSTART;VALUE=DATE-TIME:20211125T070500Z
DTEND;VALUE=DATE-TIME:20211125T070600Z
DTSTAMP;VALUE=DATE-TIME:20260310T131833Z
UID:indico-contribution-4222@events01.synchrotron.org.au
DESCRIPTION:Speakers: QING YI (The University of Queensland)\nDirect phyto
 stabilisation of Fe ore tailings is typically unfeasible due to its harsh 
 environment\, which includes strongly alkaline pH conditions\, deficient a
 vailable nutrients and organic matter and poor physical structure\, hinder
 ing microbial and plant colonisation. Eco-engineering Fe ore tailings into
  a soil-like substrate (or technosol) is an emerging technology to rehabil
 itate tailings landscapes sustainably\, involving a suite of abiotic and b
 iotic inputs (organic matter\, functional microorganisms and pioneer plant
 s). However\, the extreme alkalinity and the lack of secondary Fe-rich min
 erals are critical barriers to transforming Fe ore tailings into soil. \nU
 sing a microcosm experiment amendment with elemental sulfur (S0)\, Acidith
 iobacillus ferrooxidans demonstrated the capacity to generate acid that ne
 utralised alkaline tailings and accelerated primary mineral weathering\, i
 .e.\, technosol formation. [1] The effects of biological S0 oxidation on t
 he weathering of alkaline Fe ore tailings were examined using several high
 -resolution micro-spectroscopic techniques\, including synchrotron-based X
 -ray absorption fine structure spectroscopy (XAFS) and electron microscopy
 . It is found that: 1) A. ferrooxidans inoculum together with S0 amendment
  facilitated fast neutralisation of the alkaline Fe ore tailings\; 2) A. f
 errooxidans activities induced Fe-bearing primary mineral (e.g.\, biotite)
  weathering and nano-sized secondary mineral (e.g.\, ferrihydrite and jaro
 site) formation\; 3) the association between bacterial cells and tailing m
 inerals were facilitated by extracellular polymeric substances (EPS). The 
 behaviour and biogeochemical functionality of A. ferrooxidans in the taili
 ngs provide a fundamental basis for developing bacterial based technologie
 s towards eco-engineering tailings into a soil-like substrate for sustaina
 ble mine site rehabilitation.\n\nhttps://events01.synchrotron.org.au/event
 /146/contributions/4222/
LOCATION:Online
URL:https://events01.synchrotron.org.au/event/146/contributions/4222/
END:VEVENT
END:VCALENDAR